Optical system facilitates inspection of printed circuit boards

Optical comparator method determines the quality and registration of surface features of double-sided printed circuit boards. Color-coded superimposed images of both sides of a printed circuit board are presented to view, clearly showing details and registration of the circuitry

Fastener stretcher

A description is given of a fastener stretcher used to apply a substantial pure axial tensile force to a structural bolt or similar fastening element. The system is comprised of a pair of telescoping elements, one of which is temporarily secured to the bolt. By spreading the telescoping elements axially, the bolt is tensioned axially to permit a nut or the like to be threaded with a minimum of torque; when the elements are then removed from the bolt, the axial forces on the bolt are taken up by the nut to retain the bolt in its stressed state

Occurrence of the Bat Tick, \u3ci\u3eOrnithodoros Kelleyi\u3c/i\u3e (Acari: Argasidae), in Michigan

The bat tick, Ornithodoros kelleyi, is recorded from Michigan for the first time. A single female was collected in a building on the University of Michigan campus in Ann Arbor

Galileo early cruise, including Venus, first Earth, and Gaspra encounters

This article documents Deep Space Network (DSN) support for the Galileo cruise to Jupiter. The unique trajectory affords multiple encounters during this cruise phase. Each encounter had or will have unique requirements for data acquisition and DSN support configurations. An overview of the cruise and encounters through the asteroid Gaspra encounter is provided

Analysis of debris from APG-3, the simulated destruct system test of a full-scale Rover/NERVA reactor

Analysis of debris from simulated destruction system test of full scale Rover/NERVA reacto

The Red Jacket Peace Medal and Ethics of Repatriation

The Red Jacket Peace Medal and Ethics of Repatriation Native Americans have had a long and arduous past. Many generations of tribal nations within the geographical and political context of the United States have experienced genocide, forced relocation, had their land seized, and cultural artifacts and remains stolen since the fifteenth century. Museums have become the primary institutions now owning the majority of variously acquired artifacts of Native American cultural heritage and displaying them in pursuit of scientific study. For the long overdue injustices done to Native Americans, the Native American Graves Protection and Repatriation Act (NAGPRA) was established in 1990, under the President George H.W. Bush administration, to aid federally recognized Native American tribal nations to facilitate the repatriation or return of their artifacts being housed in these institutions. This thesis will do a deep dive into NAGPRA and what it represents to help understand the repatriation of a historically significant artifact known as the Red Jacket Peace Medal back to the Seneca Nation from the Buffalo History Museum. This paper will also expand on the issues of repatriation, review of the law of NAGPRA, along with some historic accounts of other tribes within the State of New York, and lastly, to disclose the ethics of repatriation, along with the importance of objects and case studies affiliated with NAGPRA law and cultural patrimony

Contour spectrograms for POGO analysis

Contour spectrograms for POGO analysis in Saturn S-2 and S-4b stage

EMTP based stability analysis of space station electric power system in a test bed environment

The Space Station Freedom Electric Power System (EPS) will convert solar energy into electric energy and distribute the same using an 'all dc', Power Management and Distribution (PMAD) System. Power conditioning devices (dc to dc converters) are needed to interconnect parts of this system operating at different nominal voltage levels. Operation of such devices could generate under damped oscillations (instability) under certain conditions. Criteria for instability are examined and verified for a single device. Suggested extension of the criteria to a system operation is examined by using the EMTP model of the PMAD DC test bed. Wherever possible, data from the test bed is compared with the modeling results

Toxicity of thermal degradation products of spacecraft materials

Three polymeric materials were evaluated for relative toxicity of their pyrolysis products to rats by inhalation: Y-7683 (LS 200), Y-7684 (Vonar 3 on Fiberglass), and Y-7685 (Vonar 3 on N W Polyester). Criteria employed for assessing relative toxicity were (1) lethality from in-chamber pyrolysis, (2) lethality from an outside-of-chamber pyrolysis MSTL Procedure, and (3) disruption of trained rats' shock-avoidance performance during sub-lethal exposures to in-chamber pyrolysis of the materials

A trajectory generation and system characterization model for cislunar low-thrust spacecraft. Volume 2: Technical manual

The documentation of the Trajectory Generation and System Characterization Model for the Cislunar Low-Thrust Spacecraft is presented in Technical and User's Manuals. The system characteristics and trajectories of low thrust nuclear electric propulsion spacecraft can be generated through the use of multiple system technology models coupled with a high fidelity trajectory generation routine. The Earth to Moon trajectories utilize near Earth orbital plane alignment, midcourse control dependent upon the spacecraft's Jacobian constant, and capture to target orbit utilizing velocity matching algorithms. The trajectory generation is performed in a perturbed two-body equinoctial formulation and the restricted three-body formulation. A single control is determined by the user for the interactive midcourse portion of the trajectory. The full spacecraft system characteristics and trajectory are provided as output